plugins/svn4idea/src/org/jetbrains/idea/svn/FragmentsMerger.java

   1 /*
   2  * Copyright 2000-2009 JetBrains s.r.o.
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  * http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16 package org.jetbrains.idea.svn;
  17
  18 import com.intellij.openapi.util.Factory;
  19 import com.intellij.util.Consumer;
  20
  21 public class FragmentsMerger<U, T extends Consumer<U>> {
  22   private T myData;
  23   private final Object myLock;
  24   private final Factory<T> myFactory;
  25
  26   public FragmentsMerger(final Factory<T> factory) {
  27     myFactory = factory;
  28     myLock = new Object();
  29     myData = myFactory.create();
  30   }
  31
  32   public void add(final U data) {
  33     synchronized (myLock) {
  34       // only T decides what to do with input, not the external code
  35       myData.consume(data);
  36     }
  37   }
  38
  39   public T receive() {
  40     synchronized (myLock) {
  41       final T copy = myData;
  42       myData = myFactory.create();
  43       return copy;
  44     }
  45   }
  46 }